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Just found out that in a few days another indie company, coffee stained games is releasing a game with completely the same idea as you only it's outer space. It's being released on steam.
it seems it was just unlucky it happened to me twice with the summer map where i bought launcher and it wouldn't let me select it and also I did have enough for the stun gun and I'm pretty sure it was selected. on the snow map i could buy and select my weapons with no problems
find the game really creative in it's expanding of a normal tower defence game and is really quite enjoyable, though I must ask, where the hell is d1, d2, d3, d4 etc.. I pressed the normal 1,2,3,4 etc.. but it is rather hopeless when I try changing weapon. Also i found a bug where it wouldn't allow me to buy a gun(not perfectly sure) from the shop and when pressing e on the big friendly buy button it would do, in the typical sense, nothing!